化学
均分解
镍
还原消去
位阻效应
金属转移
催化作用
立体化学
光化学
激进的
有机化学
作者
Artem V. Tsymbal,Lorenzo Delarue Bizzini,David W. C. MacMillan
摘要
Cross-coupling platforms are traditionally built around a sequence of closed-shell steps, such as oxidative addition, transmetalation, and reductive elimination. Herein, we describe a dual photo/nickel catalytic manifold that performs cross-coupling via a complementary sequence involving free radical generation, radical sorting via selective binding to a Ni(II) center, and bimolecular homolytic substitution (SH2) at a high-valent nickel-alkyl complex. This catalytic manifold enables the hitherto elusive cross-coupling of diverse aliphatic carboxylic acids to generate valuable C(sp3)-C(sp3)-products. Notably, the powerful SH2 mechanism provides general access to sterically encumbered quaternary carbon centers, addressing a long-standing challenge in fragment coupling chemistry.
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